My client took the liberty of trying to upgrade her blog to WordPress 3.4 - however when she did this... she told me that she started getting a "Page not found" error whenever she tried to log into her account. She/I can no longer see her dashboard - whenever I log in to her WordPress it automatically redirects me to:
http://melissassimplysweet.com/wp-admin/upgrade.php?_wp_http_referer=%2Fwp-admin%2F
... rather than taking me to her dashboard. I've read that it could be a plugin conflict issue and that I should try to disable all WP plugins. Since I can't get to the WP dashboard anymore, I tried to disable them through her MySQL database, however I do not know what I'm doing with MySQL and whenever I tried running the script:
UPDATE wp_options SET option_value = '' WHERE option_name = 'active_plugins';
... to disable all plugins, it notifies me "#1146 - Table 'melissassimply.wp_options' doesn't exist"
Not sure what is causing this issue but I'm really at a loss here as to what to do. I'd like to just get everything back to the way it was and downgrade to the previous version of WordPress but I don't want to lose her current WP pages and posts. Can anyone please help?